Chapter 7. Power
This chapter covers power for portable systems. Normally, laptop or portable systems have options for several sources of power, including AC (alternating current; found in the wall sockets of most buildings), power sockets in automobiles and airplanes, and several types of batteries. This chapter examines all the power sources found in a modern portable system and also focuses on power management for portables.
AC/DC Power Supplies
All portable systems at one time or another must depend on an external power source either for operation, to recharge their batteries, or both. The most commonly used external power sources are
120V 60Hz AC wall current (USA)
240V 50Hz AC wall current (Europe)
12V DC current (auto/airplane)
Note that these ...
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